Figure 2
TARGET FOR PLACEMENT ON
MARKERS OF SURVEY CONTROL
leg for ease in finding
target on photographs
D(ft.) = YS: , in which S' = photography scale in
5 feet to one inch.
D (ft.) -./S , in which S is the denominator of the
300 representative fraction
of the photography scale.
D (meters) - 1 / S , in which S is the denominator of
,000 the photography scale
expressed as 8 representative
fraction.
A significant advantage of this target design is that the
target size determined by use of these equations for a
particular photography scale will be adequate for photog-
raphy of all larger scales, but not vice versa.